Signal receiving device and electronic apparatus using the same

Abstract

A signal receiving device and an electronic apparatus using the same are provided. The signal receiving device includes a signal conversion unit, a signal analysis unit, and an impedance unit. The signal conversion unit receives an analog input signal and converts the analog input signal into a digital input signal. The signal analysis unit receives the digital input signal and analyzes a signal characteristic thereof to generate an impedance adjustment signal. The impedance unit coupled to the signal analysis unit and a signal input terminal of the signal receiving device receives the impedance adjustment signal to dynamically adjust an input impedance of the signal input terminal. Thereby, the signal receiving device analyzes an input signal to dynamically adjust the input impedance of the signal receiving device, so as to maintain an amplitude gain of the input signal to be within a limited input range of the signal receiving device.

What is claimed is: 
     
       1. A signal receiving device, comprising:
 a signal conversion unit, receiving an analog input signal and converting the analog input signal into a digital input signal; 
 a signal analysis unit, coupled to the signal conversion unit, receiving the digital input signal, and analyzing a signal characteristic of the digital input signal to generate an impedance adjustment signal; and 
 an impedance unit, coupled to the signal analysis unit and a signal input terminal of the signal receiving device, and receiving the impedance adjustment signal to dynamically adjust an input impedance of the signal input terminal, wherein the impedance unit comprises:
 a transistor, having a first terminal coupled to the signal input terminal, a second terminal coupled to a ground (GND), and a control terminal receiving the impedance adjustment signal. 
 
 
     
     
       2. The signal receiving device according to  claim 1 , wherein the signal analysis unit comprises:
 a gain analysis module, receiving the digital input signal, and analyzing an amplitude gain of the digital input signal relative to a predetermined signal to generate a digital impedance signal; and 
 a digital-to-analog conversion module, coupled to the gain analysis module, receiving the digital impedance signal, and converting the digital impedance signal into the analog impedance adjustment signal. 
 
     
     
       3. The signal receiving device according to  claim 1 , wherein the signal conversion unit is an analog-to-digital converter. 
     
     
       4. The signal receiving device according to  claim 1  further comprising:
 a processing unit, comprising a first gain control unit, wherein the first gain control unit receives the digital input signal and adjusts a gain of the digital input signal, and the processing unit processes the digital input signal. 
 
     
     
       5. The signal receiving device according to  claim 1 , wherein the signal conversion unit, the signal analysis unit, and the impedance unit are implemented as an integrated circuit (IC). 
     
     
       6. An electronic apparatus, comprising:
 a signal receiving device, receiving an analog input signal from a signal source, and converting the analog input signal into a digital input signal; and 
 a processing unit, receiving and processing the digital input signal, 
 wherein the signal receiving device comprises:
 a signal conversion unit, receiving the analog input signal and converting the analog input signal into a digital input signal; 
 a signal analysis unit, coupled to the signal conversion unit, receiving the digital input signal, and analyzing a signal characteristic of the digital input signal to generate an impedance adjustment signal; and 
 
 an impedance unit, coupled to the signal analysis unit and a signal input terminal of the signal receiving device, and receiving the impedance adjustment signal to dynamically adjust an input impedance of the signal input terminal, wherein the impedance unit comprises:
 a transistor, having a first terminal coupled to the signal input terminal, a second terminal coupled to a ground (GND), and control terminal receiving the impedance adjustment signal. 
 
 
     
     
       7. The electronic apparatus according to  claim 6 , wherein the signal analysis unit comprises:
 a gain analysis module, receiving the digital input signal, and analyzing an amplitude gain of the digital input signal relative to a predetermined signal to generate a digital impedance signal; and 
 a digital-to-analog conversion module, coupled to the gain analysis module, receiving the digital impedance signal, and converting the digital impedance signal into the analog impedance adjustment signal. 
 
     
     
       8. The electronic apparatus according to  claim 6  further comprising:
 a capacitor, having a first terminal coupled to the signal input terminal of the electronic apparatus, and a second terminal coupled to an input terminal of the signal conversion unit.